📚 KS3 CIE Chemistry: Key Terms Memorisation Guide | KS3 CIE 化学：核心术语速记指南
Mastering the language of chemistry is the first step to understanding how substances behave and interact. This guide presents essential KS3 CIE chemistry vocabulary with clear definitions and simple memory tricks. Each key term is introduced in an English paragraph immediately followed by its Chinese equivalent, making it easy to study bilingually and remember faster.
掌握化学的语言是理解物质如何行为和相互作用的第一步。本指南提供了 KS3 CIE 化学核心词汇，配有清晰的定义和简单的记忆窍门。每个关键术语都先用英文段落介绍，紧接着是中文段落，方便你双语学习、快速记忆。
1. States of Matter and Changes of State | 物质状态与状态变化
Solid: A state of matter with a fixed shape and volume. Particles are arranged in a regular pattern, held tightly together and can only vibrate. Memory tip: 'Solid' sounds firm, like a rock that never flows.
固体: 具有固定形状和体积的物质状态。粒子以规则排列、紧密结合，只能振动。记忆窍门：'Solid' 听起来很坚固，像永不流动的岩石。
Liquid: A state that has a definite volume but takes the shape of its container. Particles are close but can slide past one another. Trick: Think of 'liquid' as something that flows – 'a liquid lunch' adapts to the cup.
液体: 有确定的体积但形状随容器改变。粒子靠近但可以相互滑动。窍门：把 'liquid' 想成流动的东西 – '液体午餐' 会适应杯子的形状。
Gas: A state with no fixed shape or volume; particles are far apart and move rapidly in all directions. Memory aid: 'Gas' spreads out – like an 'invisible wind'.
气体: 没有固定形状或体积；粒子相距很远并快速向各个方向运动。记忆辅助：'Gas' 会扩散 – 像 '看不见的风'。
Melting: The change from solid to liquid when heated. Melting point is the temperature at which a solid becomes a liquid. Think 'melt' sounds like 'felt' – you feel the warmth as ice melts.
熔化: 加热时由固体变为液体的过程。熔点是固体变为液体的温度。想象 'melt' 听起来像 'felt' – 随着冰融化你感受到暖意。
Freezing: The reverse of melting; a liquid turns into a solid when cooled. Freezing point equals the melting point for a pure substance. Associate 'freeze' with frozen water – it becomes hard.
凝固: 熔化的逆过程；冷却时液体变成固体。纯物质的凝固点与熔点相同。把 'freeze' 和结冰的水联系起来 – 它变硬了。
Boiling: The rapid change from liquid to gas occurring throughout the liquid at a specific temperature – the boiling point. Visualise bubbles rising: 'boil' sounds like 'bubble'.
沸腾: 在特定温度（沸点）下，整个液体内部迅速变为气体的过程。想象气泡上升：'boil' 听起来像 'bubble'。
Evaporation: A slower change from liquid to gas that takes place only at the surface of a liquid, below boiling point. 'E-vapor-ation' – vapour escapes gently.
蒸发: 仅在液体表面发生的、温度低于沸点时较慢的由液体变为气体的过程。'E-vapor-ation' – 蒸汽缓慢逸出。
Condensation: The change from gas to liquid on cooling. Memory trick: 'Condense' makes you think of denser droplets forming on a cold surface.
冷凝: 冷却时由气体变为液体的过程。记忆窍门：'Condense' 让人想到更致密的小液滴在冰冷表面上形成。
Sublimation: The direct change from solid to gas without passing through the liquid state. 'Sublime' comes from Latin meaning 'to rise up' – solid rises as gas.
升华: 不经过液态而由固体直接变成气体的过程。'Sublime' 源于拉丁语，意为 '上升' – 固体直接升华为气体。
2. Particles and Kinetic Theory | 粒子与动力学理论
Particle: A tiny piece of matter – or ion. The particle model helps explain the behaviour of solids, liquids and gases. Think 'particle' = 'small part'.
粒子: 微小的物质单元 – 原子、分子或离子。粒子模型有助于解释固体、液体和气体的行为。记住 'particle' = '小的部分'。
Kinetic energy: The energy that particles possess due to their motion. The higher the temperature, the greater the kinetic energy. 'Kinetic' relates to movement – like 'kinesiology' (study of motion).
动能: 粒子由于运动而具有的能量。温度越高，动能越大。'Kinetic' 与运动有关 – 像 'kinesiology'（运动学）。
Diffusion: The net movement of particles from an area of higher concentration to an area of lower concentration. It occurs in liquids and gases. 'Diffusion' sounds like 'di-ffusion' – two ways of spreading out.
扩散: 粒子从高浓度区域向低浓度区域的净移动。发生在液体和气体中。'Diffusion' 听起来像 'di-ffusion' – 两个方向散开。
Matter: Anything that has mass and takes up space. All solids, liquids and gases are matter. 'Matter' – what matters is that it has mass.
物质: 任何具有质量并占据空间的东西。所有固体、液体和气体都是物质。'Matter' – 重点是有质量。
3. Atoms, Elements and the Periodic Table | 原子、元素与周期表
Atom: The smallest particle of an element that can take part in a chemical reaction. 'Atom' comes from Greek 'atomos' meaning indivisible (a- = not, tomos = cut).
原子: 能参与化学反应的元素最小粒子。'Atom' 源自希腊语 'atomos'，意为不可分割（a- = 不，tomos = 切）。
Element: A pure substance made of only one type of atom. There are about 100 elements, listed in the Periodic Table. 'Element' – a simple, essential building block.
元素: 仅由一种原子组成的纯物质。大约有 100 种元素，列在周期表中。'Element' – 简单的基本积木。
Proton: A positively charged subatomic particle found in the nucleus. Memory: 'proton' sounds like 'positive-ton'.
质子: 原子核中带正电的亚原子粒子。记忆：'proton' 听起来像 'positive-ton'。
Neutron: A neutral subatomic particle in the nucleus with no charge. 'Neutron' starts with 'neutr-' like 'neutral'.
中子: 原子核中不带电的中性亚原子粒子。'Neutron' 以 'neutr-' 开头，就像 'neutral'。
Electron: A negatively charged particle that orbits the nucleus in shells. 'Electron' – think 'electricity' and 'negative'.
电子: 带负电、在核外分壳层运动的粒子。'Electron' – 联想到 'electricity' 和负电。
Nucleus: The central core of an atom containing protons and neutrons. The nucleus is tiny but contains most of the atom's mass. 'Nucleus' is like the 'nucleus' of a cell – the control centre.
原子核: 原子的中心核，含有质子和中子。原子核极小但占据了大部分原子质量。'Nucleus' 就像细胞的 '细胞核' – 控制中心。
Atomic number: The number of protons in an atom's nucleus; it identifies the element. 'Atomic number' = 'element's identity number'.
原子序数: 原子核内质子的数目；它决定了元素的身份。'原子序数' = '元素身份号'。
Mass number: l : The total number of protons and neutrons in a nucleus. Remember: mass number = protons + neutrons.
质量数: 原子核中质子与中子的总数。记住：质量数 = 质子数 + 中子数。
Periodic Table: A chart organising all known elements in order of increasing atomic number, arranged into groups (vertical columns) and periods (horizontal rows). 'Periodic' means recurring patterns – properties repeat.
周期表: 将所有已知元素按原子序数递增排列的图表，分为族（竖列）和周期（横行）。'Periodic' 意指周期性 – 性质重复出现。
Group: number of outer shell electrons. Group number = number of outer electrons for many groups.
族: 周期表中的竖列。同族元素具有相似的化学性质和相同的最外层电子数。对很多族来说，族序数 = 最外层电子数。
Period: A horizontal row in the Periodic Table. The period number tells you the number of electron shells. 'Period' sounds like 'row-period'.
周期: 周期表中的横行。周期序数表明电子层数。'Period' 听起来像 'row-period'。
4. Compounds and Chemical Formulae | 化合物与化学式
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